M=require("ming_node");
/**
 * serialport@10.4.0
 */
const { SerialPort } = require('serialport')


class CrcUtils{
    static  _auchCRCHi = [
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
        0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
        0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
        0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
        0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
        0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
        0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
        0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
        0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
        0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
        0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
        0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
        0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
        0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
        0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
    ];
    static _auchCRCLo = [
        0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
        0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
        0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
        0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
        0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
        0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
        0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
        0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
        0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
        0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
        0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
        0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
        0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
        0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
        0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
        0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
        0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
        0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
        0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
        0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
        0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
        0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
        0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
        0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
        0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
        0x43, 0x83, 0x41, 0x81, 0x80, 0x40
    ];

   static CRC16Str = function (buffer) {
        var hi = 0xff;
        var lo = 0xff;
        for (var i = 0; i < buffer.length; i++) {
            var idx = hi ^ buffer[i];
            hi = (lo ^ CrcUtils._auchCRCHi[idx]);
            lo = CrcUtils._auchCRCLo[idx];
        }
        return CrcUtils.padLeft((hi << 8 | lo).toString(16).toUpperCase(), 4, '0');
    };

    static  CRC16 = function (buffer) {
        var hi = 0xff;
        var lo = 0xff;
        for (var i = 0; i < buffer.length; i++) {
            var idx = hi ^ buffer[i];
            hi = (lo ^ CrcUtils._auchCRCHi[idx]);
            lo = CrcUtils._auchCRCLo[idx];
        }
        return [hi,lo];
    };
    static isArray = function (arr) {
        return Object.prototype.toString.call(arr) === '[object Array]';
    };

    static ToCRC16 = function (str) {
        return CrcUtils.CRC16(CrcUtils.isArray(str) ? str : CrcUtils.strToByte(str));
    };

    static ToModbusCRC16 = function (str) {
        return CrcUtils.CRC16(CrcUtils.isArray(str) ? str : CrcUtils.strToHex(str));
    };

    static strToByte = function (str) {
        var tmp = str.split(''), arr = [];
        for (var i = 0, c = tmp.length; i < c; i++) {
            var j = encodeURI(tmp[i]);
            if (j.length == 1) {
                arr.push(j.charCodeAt());
            } else {
                var b = j.split('%');
                for (var m = 1; m < b.length; m++) {
                    arr.push(parseInt('0x' + b[m]));
                }
            }
        }
        return arr;
    };

    static convertChinese = function (str) {
        var tmp = str.split(''), arr = [];
        for (var i = 0, c = tmp.length; i < c; i++) {
            var s = tmp[i].charCodeAt();
            if (s <= 0 || s >= 127) {
                arr.push(s.toString(16));
            }
            else {
                arr.push(tmp[i]);
            }
        }
        return arr;
    };

    static filterChinese = function (str) {
        var tmp = str.split(''), arr = [];
        for (var i = 0, c = tmp.length; i < c; i++) {
            var s = tmp[i].charCodeAt();
            if (s > 0 && s < 127) {
                arr.push(tmp[i]);
            }
        }
        return arr;
    };

    static strToHex = function (hex, isFilterChinese) {
        hex = isFilterChinese ? CrcUtils.filterChinese(hex).join('') : CrcUtils.convertChinese(hex).join('');

        //清除所有空格
        hex = hex.replace(/\s/g, "");
        //若字符个数为奇数，补一个空格
        hex += hex.length % 2 != 0 ? " " : "";

        var c = hex.length / 2, arr = [];
        for (var i = 0; i < c; i++) {
            arr.push(parseInt(hex.substr(i * 2, 2), 16));
        }
        return arr;
    };

    static padLeft = function (s, w, pc) {
        if (pc == undefined) {
            pc = '0';
        }
        for (var i = 0, c = w - s.length; i < c; i++) {
            s = pc + s;
        }
        return s;
    };
}
class MB_ENUM{
    static MB_ADDRESS_BROADCAST =   ( 0 )   /*! Modbus broadcast address. */
    static MB_ADDRESS_MIN =          ( 1 )   /*! Smallest possible slave address. */
    static MB_ADDRESS_MAX =          ( 247 ) /*! Biggest possible slave address. */
    static MB_FUNC_NONE  =                         (  0 )
    static MB_FUNC_READ_COILS  =                   (  1 )
    static MB_FUNC_READ_DISCRETE_INPUTS=           (  2 )
    static MB_FUNC_WRITE_SINGLE_COIL =             (  5 )
    static MB_FUNC_WRITE_MULTIPLE_COILS =          ( 15 )
    static MB_FUNC_READ_HOLDING_REGISTER =         (  3 )
    static MB_FUNC_READ_INPUT_REGISTER  =          (  4 )
    static MB_FUNC_WRITE_REGISTER    =             (  6 )
    static MB_FUNC_WRITE_MULTIPLE_REGISTERS =      ( 16 )
    static MB_FUNC_READWRITE_MULTIPLE_REGISTERS=   ( 23 )
    static MB_FUNC_DIAG_READ_EXCEPTION =           (  7 )
    static MB_FUNC_DIAG_DIAGNOSTIC  =              (  8 )
    static MB_FUNC_DIAG_GET_COM_EVENT_CNT =        ( 11 )
    static MB_FUNC_DIAG_GET_COM_EVENT_LOG =        ( 12 )
    static MB_FUNC_OTHER_REPORT_SLAVEID  =         ( 17 )
    static MB_FUNC_ERROR =                         ( 128 )
}
class ModBusRtuMasterUtils {
    /// <summary>
    /// 读取从1到2000的线圈状态
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要读取起始地址</param>
    /// <param name="numberOfPoints">要读取的数量</param>
    /// <returns>线圈数据</returns>
    static readCoils(slaveAddress, startAddress, numberOfPoints) {
        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x01);
        //起始地址
        byteList.push(startAddress >> 8 & 0xff);
        byteList.push(startAddress & 0xff);
        //数量
        byteList.push(numberOfPoints >> 8 & 0xff);
        byteList.push(numberOfPoints & 0xff);
        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }


    /// <summary>
    ///    读取1到2000离散输入的状态
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要读取起始地址</param>
    /// <param name="numberOfPoints">要读取的数量</param>
    /// <returns>离散数据</returns>
    static readInputs(slaveAddress, startAddress, numberOfPoints) {
        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x02);
        //起始地址
        byteList.push((startAddress >> 8 & 0xff));
        byteList.push((startAddress & 0xff));
        //数量
        byteList.push((numberOfPoints >> 8 & 0xff));
        byteList.push((numberOfPoints & 0xff));

        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }

    /// <summary>
    ///    读取保持寄存器数据。
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要读取起始地址</param>
    /// <param name="numberOfPoints">要读取的数量</param>
    /// <returns>保持寄存器数据</returns>
    static readHoldingRegisters(slaveAddress, startAddress, numberOfPoints) {

        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x03);
        //起始地址
        byteList.push((startAddress >> 8 & 0xff));
        byteList.push((startAddress & 0xff));
        //数量
        byteList.push((numberOfPoints >> 8 & 0xff));
        byteList.push((numberOfPoints & 0xff));

        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }

    /// <summary>
    /// 读取输入寄存器数据。
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要读取起始地址</param>
    /// <param name="numberOfPoints">要读取的数量</param>
    /// <returns>输入寄存器数据</returns>
    static readInputRegisters(slaveAddress, startAddress, numberOfPoints) {

        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x04);
        //起始地址
        byteList.push((startAddress >> 8 & 0xff));
        byteList.push((startAddress & 0xff));
        //数量
        byteList.push((numberOfPoints >> 8 & 0xff));
        byteList.push((numberOfPoints & 0xff));

        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }

    /// <summary>
    ///  写单个线圈。
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要写入起始地址</param>
    /// <param name="value">要写入的值</param>
    static writeSingleCoil(slaveAddress, startAddress, value) {
        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x05);
        //起始地址
        byteList.push((startAddress >> 8 & 0xff));
        byteList.push((startAddress & 0xff));
        //值
        if (value > 0) {
            byteList.push(0xff);
            byteList.push(0x00);
        } else {
            byteList.push(0x00);
            byteList.push(0x00);
        }

        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }


    /// <summary>
    ///  写单个保持寄存器。
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要写入的起始地址</param>
    /// <param name="value">要写入的值</param>
    static writeSingleRegister(slaveAddress, startAddress, value) {
        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x06);
        //起始地址
        byteList.push((startAddress >> 8 & 0xff));
        byteList.push((startAddress & 0xff));
        //值
        byteList.push((value >> 8 & 0xff));
        byteList.push((value & 0xff));
        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }

    /// <summary>
    ///  写多个保持寄存器数据（1到123，限制了数据，如要扩展需要修改）
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要写入的起始地址</param>
    /// <param name="data">要写入的值</param>
    static writeMultipleRegisters(slaveAddress, startAddress, data) {
        const byteList = [];
        byteList.push(slaveAddress);
        //功能码
        byteList.push(0x10);
        //起始地址
        byteList.push((startAddress >> 8 & 0xff));
        byteList.push((startAddress & 0xff));
        //寄存器数
        let regCount = data.length;
        byteList.push((regCount >> 8 & 0xff));
        byteList.push((regCount & 0xff));

        //字节数
        let byteCount = (regCount * 2);
        byteList.push((byteCount & 0xff));
        //值
        for (let i = 0; i < data.length; i++) {
            //高位的先发送
            byteList.push((data[data.length - i - 1] >> 8 & 0xff));
            byteList.push((data[data.length - i - 1] & 0xff));
        }

        //crc
        let crc = CrcUtils.CRC16(byteList);
        byteList.push(crc[0]);
        byteList.push(crc[1]);
        return byteList;
    }

    /// <summary>
    ///  写多个线圈
    /// </summary>
    /// <param name="slaveAddress">从设备的地址</param>
    /// <param name="startAddress">要写入的起始地址</param>
    /// <param name="data">要写入的值</param>
    static writeMultipleCoils(slaveAddress, startAddress, data) {
        return null;
    }


}





class ModBusRtuMasterPlugin {
    /**
     * 转换为浮点数
     * @param h16
     * @param l16
     */
     parseFloat32([h16,l16]){
        const buf = Buffer.allocUnsafe(4);
        buf.writeUInt16BE(h16,2);
        buf.writeUInt16BE(l16,0);
        let r = buf.readFloatBE(0);
        return r;
    }


    constructor({com,brand}) {
        this.sp = new SerialPort({ path: com, baudRate: brand });
        console.log(`connect ${com} ${brand}`)
        this.init();
    }

    static callResolve=null;




    /**
     * 读取从1到2000的线圈状态
     * @param slaveAddress
     * @param startAddress
     * @param numberOfPoints
     * @returns {Promise<unknown>}
     */
    async readCoils(slaveAddress,  startAddress,  numberOfPoints){
        let r=  ModBusRtuMasterUtils.readCoils(slaveAddress,  startAddress,  numberOfPoints);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 读取1到2000离散输入的状态
     * @param slaveAddress
     * @param startAddress
     * @param numberOfPoints
     * @returns {Promise<unknown>}
     */
    async readInputs(slaveAddress,  startAddress,  numberOfPoints){
        let r=  ModBusRtuMasterUtils.readInputs(slaveAddress,  startAddress,  numberOfPoints);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 读取保持寄存器数据
     * @param slaveAddress
     * @param startAddress
     * @param numberOfPoints
     * @returns {Promise<unknown>}
     */
    async readHoldingRegisters(slaveAddress,  startAddress,  numberOfPoints){
        let r=  ModBusRtuMasterUtils.readHoldingRegisters(slaveAddress,  startAddress,  numberOfPoints);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 读取输入寄存器数据
     * @param slaveAddress
     * @param startAddress
     * @param numberOfPoints
     * @returns {Promise<unknown>}
     */
    async readInputRegisters(slaveAddress,  startAddress,  numberOfPoints){
        let r=  ModBusRtuMasterUtils.readInputRegisters(slaveAddress,  startAddress,  numberOfPoints);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 写单个线圈
     * @param slaveAddress
     * @param startAddress
     * @param value
     * @returns {Promise<unknown>}
     */
    async writeSingleCoil(slaveAddress,  startAddress,  value){
        let r=  ModBusRtuMasterUtils.writeSingleCoil(slaveAddress,  startAddress,  value);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 写单个保持寄存器
     * @param slaveAddress
     * @param startAddress
     * @param value
     * @returns {Promise<unknown>}
     */
    async writeSingleRegister(slaveAddress,  startAddress,  value){
        let r=  ModBusRtuMasterUtils.writeSingleRegister(slaveAddress,  startAddress,  value);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 写多个保持寄存器数据（1到123，限制了数据，如要扩展需要修改）
     * @param slaveAddress
     * @param startAddress
     * @param data short数组
     * @returns {Promise<unknown>}
     */
    async writeMultipleRegisters(slaveAddress,  startAddress,  data){
        let r=  ModBusRtuMasterUtils.writeMultipleRegisters(slaveAddress,  startAddress,  data);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    /**
     * 写多个线圈
     * @param slaveAddress
     * @param startAddress
     * @param data
     * @returns {Promise<unknown>}
     * @constructor
     */
    async writeMultipleCoils(slaveAddress,  startAddress,  data){
        let r=  ModBusRtuMasterUtils.writeMultipleCoils(slaveAddress,  startAddress,  data);
        this.sp.write(new Uint8Array(r));
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve("timeOut"), 1000);
            ModBusRtuMasterPlugin.callResolve=resolve;
        })
    }

    install(app,args){

    }


    init(){
        // 以 paused mode 监听收到的数据，需要主动读取数据
       this.sp.on('readable', async () => {
           await M.delayMs(5);
           let reqBuffer=  this.sp.read();
           let o=[];
           if(reqBuffer==null || reqBuffer.length<5){
               return [];
           }
           switch (reqBuffer[1]){
               case MB_ENUM.MB_FUNC_WRITE_SINGLE_COIL:
               case MB_ENUM.MB_FUNC_WRITE_MULTIPLE_COILS:
               case MB_ENUM.MB_FUNC_WRITE_REGISTER:
               case MB_ENUM.MB_FUNC_WRITE_MULTIPLE_REGISTERS:
               {
                   break;
               }

               /**
                * 07 04 06 03 53 01 F3 01 05
                */
               case MB_ENUM.MB_FUNC_READ_INPUT_REGISTER:{
                   let byteNum=reqBuffer[2];
                   for (let i=0;i<byteNum;i=i+2){
                       let h=reqBuffer[3+i]*256+reqBuffer[3+i+1];
                       o.push(h);
                   }
                   break;
               }
               /**
                * 03 01 05 53 6B 01 F4 1B
                */
               case MB_ENUM.MB_FUNC_READ_COILS:{
                   let byteNum=reqBuffer[2];
                   for (let i=0;i<byteNum;i++){
                       for (let j=0;j<8;j++){
                           if(0x80 & reqBuffer[3+i]<<j ){
                               o.push(1) ;
                           }else {
                               o.push(0) ;
                           }
                       }
                   }
                   break;
               }
               case MB_ENUM.MB_FUNC_READ_DISCRETE_INPUTS:{
                   let byteNum=reqBuffer[2];
                   for (let i=0;i<byteNum;i++){
                       for (let j=0;j<8;j++){
                           if(0x80 & reqBuffer[3+i]<<j ){
                               o.push(1) ;
                           }else {
                               o.push(0) ;
                           }
                       }
                   }
                   break;
               }
               case MB_ENUM.MB_FUNC_READ_HOLDING_REGISTER:{
                   let byteNum=reqBuffer[2];
                   for (let i=0;i<byteNum;i=i+2){
                       let h=reqBuffer[3+i]*256+reqBuffer[3+i+1];
                       o.push(h);
                   }
                   break;
               }
           }
           if(ModBusRtuMasterPlugin.callResolve){
               ModBusRtuMasterPlugin.callResolve(o);
               ModBusRtuMasterPlugin.callResolve=null;
           }
        });


        this.sp.on('data', (data) => {

            // console.log(data);
        });

    }

}

module.exports = ModBusRtuMasterPlugin;